The "Hitman more than Airsoft" channel of Hitman Airsoft in Ukraine give us their take on the Double Bell HK416 BY-812S AEG. Featuring a quick spring change system with a 7mm bearing gearbox, it has a functional bolt catch, folding sights, attachements for the QD sling, steel silencer on a 14mm thread, and 6.03 tight bore inner barrel.